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using System; using System.Collections; using System.Text; public class SamplesHashtable  {     public static void Main()  {         // Create and initialize a new Hashtable.         Hashtable table = new Hashtable();         //Student Name, Grade         table.Add("Jay", 100);         table.Add("Brian", 87);         table.Add("Rajesh", 92);         table.Add("Bill", 76);         table.Add("Brad", 84);         table.Add("Kit", 91);         table.Add("Vinaya", 80);         table.Add("Lakshan", 87);         // Display the properties and values of the Hashtable.             Console.WriteLine("Count: {0}", table.Count );         PrintTable( table );         Console.WriteLine();         int g = (int) table["Jay"];         Console.WriteLine ("Jay's grade is: {0}", g);         Console.WriteLine();         PrintItems ("All Names", table.Keys);                      Console.WriteLine();         PrintItems ("All Grades", table.Values);     }     public static void PrintTable( Hashtable myList )  {         Console.WriteLine ("{0,-8} {1,-8}", "Name","Grade");         Console.WriteLine ("{0,-8} {1,-8}", "----","-----");         foreach (DictionaryEntry e in myList) {             Console.WriteLine ("{0,-8} {1,-8}", e.Key, e.Value);         }     }     public static void PrintItems(string title, IEnumerable    myList )  {         Console.Write ("{0}: ", title);         StringBuilder sb = new StringBuilder();         foreach (object o in myList) {             sb.AppendFormat( "{0}, ", o);         }         sb.Remove (sb.Length-2,2);         Console.WriteLine(sb);     } }  

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